package com.vip.common.util;

import java.util.Locale;

/**
 * 进制转换
 *
 * @author LEON
 */
public class HexBinUtils {
    private static final char[] M_CHARS = "0123456789ABCDEF".toCharArray();
    private static final String M_HEX_STR = "0123456789ABCDEF";
    /**
     * 检查16进制字符串是否有效
     * @param sHex String 16进制字符串
     * @return boolean
     */
    public static boolean checkHexStr(String sHex) {
        String sTmp = sHex.toString().trim().replace(" ", "").toUpperCase(Locale.US);
        int iLen = sTmp.length();
        if ((iLen > 1) && (iLen % 2 == 0)) {
            for (int i = 0; i < iLen; i++) {
                if (!sHex.contains(sTmp.substring(i, i + 1))) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    /**
     * 字符串转换成十六进制字符串
     * @param str String 待转换的ASCII字符串
     * @return String 每个Byte之间空格分隔，如: [61 6C 6B]
     */
    public static String str2HexStr(String str) {
        StringBuilder sb = new StringBuilder();
        byte[] bs = str.getBytes();
        for (int i = 0; i < bs.length; i++) {
            sb.append(M_CHARS[((bs[i] & 0xFF) >> 4)]);
            sb.append(M_CHARS[(bs[i] & 0xF)]);
            sb.append(' ');
        }
        return sb.toString().trim();
    }

    /**
     * 十六进制字符串转换成 ASCII字符串
     * @param hexStr String Byte字符串
     * @return String 对应的字符串
     */
    public static String hexStr2Str(String hexStr) {
        hexStr = hexStr.trim().replace(" ", "").toUpperCase(Locale.US);
        char[] hexs = hexStr.toCharArray();
        byte[] bytes = new byte[hexStr.length() / 2];
        int iTmp = 0;
        for (int i = 0; i < bytes.length; i++) {
            iTmp = M_HEX_STR.indexOf(hexs[(2 * i)]) << 4;
            iTmp |= M_HEX_STR.indexOf(hexs[(2 * i + 1)]);
            bytes[i] = ((byte) (iTmp & 0xFF));
        }
        return new String(bytes);
    }

    /**
     * bytes转换成十六进制字符串
     * @param b byte[] byte数组
     * @param iLen int 取前N位处理 N=iLen
     * @return String 每个Byte值之间空格分隔
     */
    public static String byte2HexStr(byte[] b, int iLen) {
        StringBuilder sb = new StringBuilder();
        for (int n = 0; n < iLen; n++) {
            sb.append(M_CHARS[((b[n] & 0xFF) >> 4)]);
            sb.append(M_CHARS[(b[n] & 0xF)]);
            sb.append(' ');
        }
        return sb.toString().trim().toUpperCase(Locale.US);
    }

    public static String byte2hex(byte[] buffer) {
        StringBuilder h = new StringBuilder();
        for (int i = 0; i < buffer.length; i++) {
            String temp = Integer.toHexString(buffer[i] & 0xFF);
            if (temp.length() == 1) {
                temp = "0" + temp;
            }
            h.append(" ").append(temp);
        }
        return h.toString();
    }

    /**
     * bytes字符串转换为Byte值
     *
     * @param src Byte字符串，每个Byte之间没有分隔符(字符范围:0-9 A-F)
     * @return byte[]
     */
    public static byte[] hexStr2Bytes(String src) {
        //对输入值进行规范化整理
        src = src.trim().replace(" ", "").toUpperCase(Locale.US);
        //处理值初始化
        int m = 0;
        int n = 0;
        int iLen = src.length() / 2;
        byte[] ret = new byte[iLen];
        for (int i = 0; i < iLen; i++) {
            m = i * 2 + 1;
            n = m + 1;
            ret[i] = ((byte) (Integer.decode("0x" + src.substring(i * 2, m) + src.substring(m, n)) & 0xFF));
        }
        return ret;
    }

    /**
     * String的字符串转换成unicode的String
     * @param strText String 全角字符串
     * @return String 每个unicode之间无分隔符
     */
    public static String strToUnicode(String strText) {
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < strText.length(); i++) {
            int intAsc = strText.charAt(i);
            String strHex = Integer.toHexString(intAsc);
            if (intAsc > 128) {
                str.append("\\u");
            } else {
                str.append("\\u00");
            }
            str.append(strHex);
        }
        return str.toString();
    }

    /**
     * unicode的String转换成String的字符串
     * @param hex String 16进制值字符串 （一个unicode为2byte）
     * @return String 全角字符串
     */
    public static String unicodeToString(String hex) {
        int t = hex.length() / 6;
        int iTmp = 0;
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < t; i++) {
            String s = hex.substring(i * 6, (i + 1) * 6);

            iTmp = Integer.valueOf(s.substring(2, 4), 16) << 8 | Integer.valueOf(s.substring(4), 16);

            str.append(new String(Character.toChars(iTmp)));
        }
        return str.toString();
    }
}



